diff options
Diffstat (limited to 'framework/src/onos/apps/bgprouter/src/main/java/org/onosproject/bgprouter/IcmpHandler.java')
-rw-r--r-- | framework/src/onos/apps/bgprouter/src/main/java/org/onosproject/bgprouter/IcmpHandler.java | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/framework/src/onos/apps/bgprouter/src/main/java/org/onosproject/bgprouter/IcmpHandler.java b/framework/src/onos/apps/bgprouter/src/main/java/org/onosproject/bgprouter/IcmpHandler.java new file mode 100644 index 00000000..88265350 --- /dev/null +++ b/framework/src/onos/apps/bgprouter/src/main/java/org/onosproject/bgprouter/IcmpHandler.java @@ -0,0 +1,157 @@ +/* + * Copyright 2015 Open Networking Laboratory + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.onosproject.bgprouter; + +import org.onlab.packet.Ethernet; +import org.onlab.packet.ICMP; +import org.onlab.packet.IPv4; +import org.onlab.packet.IpAddress; +import org.onosproject.incubator.net.intf.Interface; +import org.onosproject.incubator.net.intf.InterfaceService; +import org.onosproject.net.ConnectPoint; +import org.onosproject.net.flow.DefaultTrafficTreatment; +import org.onosproject.net.flow.TrafficTreatment; +import org.onosproject.net.host.InterfaceIpAddress; +import org.onosproject.net.packet.DefaultOutboundPacket; +import org.onosproject.net.packet.InboundPacket; +import org.onosproject.net.packet.OutboundPacket; +import org.onosproject.net.packet.PacketContext; +import org.onosproject.net.packet.PacketProcessor; +import org.onosproject.net.packet.PacketService; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.nio.ByteBuffer; + +public class IcmpHandler { + + private static final Logger log = LoggerFactory.getLogger(IcmpHandler.class); + + private final PacketService packetService; + private final InterfaceService interfaceService; + + private final IcmpProcessor processor = new IcmpProcessor(); + + + public IcmpHandler(InterfaceService interfaceService, + PacketService packetService) { + this.interfaceService = interfaceService; + this.packetService = packetService; + } + + public void start() { + packetService.addProcessor(processor, PacketProcessor.director(4)); + } + + public void stop() { + packetService.removeProcessor(processor); + } + + private void processPacketIn(InboundPacket pkt) { + + boolean ipMatches = false; + Ethernet ethernet = pkt.parsed(); + IPv4 ipv4 = (IPv4) ethernet.getPayload(); + ConnectPoint connectPoint = pkt.receivedFrom(); + IpAddress destIpAddress = IpAddress.valueOf(ipv4.getDestinationAddress()); + Interface targetInterface = interfaceService.getMatchingInterface(destIpAddress); + + if (targetInterface == null) { + log.trace("No matching interface for {}", destIpAddress); + return; + } + + for (InterfaceIpAddress interfaceIpAddress: targetInterface.ipAddresses()) { + if (interfaceIpAddress.ipAddress().equals(destIpAddress)) { + ipMatches = true; + break; + } + } + + if (((ICMP) ipv4.getPayload()).getIcmpType() == ICMP.TYPE_ECHO_REQUEST && + ipMatches) { + sendICMPResponse(ethernet, connectPoint); + } + } + + private void sendICMPResponse(Ethernet icmpRequest, ConnectPoint outport) { + + Ethernet icmpReplyEth = new Ethernet(); + + IPv4 icmpRequestIpv4 = (IPv4) icmpRequest.getPayload(); + IPv4 icmpReplyIpv4 = new IPv4(); + + int destAddress = icmpRequestIpv4.getDestinationAddress(); + icmpReplyIpv4.setDestinationAddress(icmpRequestIpv4.getSourceAddress()); + icmpReplyIpv4.setSourceAddress(destAddress); + icmpReplyIpv4.setTtl((byte) 64); + icmpReplyIpv4.setChecksum((short) 0); + + ICMP icmpReply = new ICMP(); + icmpReply.setIcmpType(ICMP.TYPE_ECHO_REPLY); + icmpReply.setIcmpCode(ICMP.SUBTYPE_ECHO_REPLY); + icmpReply.setChecksum((short) 0); + + icmpReplyIpv4.setPayload(icmpReply); + + icmpReplyEth.setPayload(icmpReplyIpv4); + icmpReplyEth.setEtherType(Ethernet.TYPE_IPV4); + icmpReplyEth.setDestinationMACAddress(icmpRequest.getSourceMACAddress()); + icmpReplyEth.setSourceMACAddress(icmpRequest.getDestinationMACAddress()); + icmpReplyEth.setVlanID(icmpRequest.getVlanID()); + + sendPacketOut(outport, icmpReplyEth); + + } + + private void sendPacketOut(ConnectPoint outport, Ethernet payload) { + TrafficTreatment treatment = DefaultTrafficTreatment.builder(). + setOutput(outport.port()).build(); + OutboundPacket packet = new DefaultOutboundPacket(outport.deviceId(), + treatment, ByteBuffer.wrap(payload.serialize())); + packetService.emit(packet); + } + + /** + * Packet processor responsible receiving and filtering ICMP packets. + */ + private class IcmpProcessor implements PacketProcessor { + + @Override + public void process(PacketContext context) { + // Stop processing if the packet has been handled, since we + // can't do any more to it. + + if (context.isHandled()) { + return; + } + + Ethernet packet = context.inPacket().parsed(); + + if (packet == null) { + return; + } + + if (packet.getEtherType() == Ethernet.TYPE_IPV4) { + IPv4 ipv4Packet = (IPv4) packet.getPayload(); + if (ipv4Packet.getProtocol() == IPv4.PROTOCOL_ICMP) { + processPacketIn(context.inPacket()); + } + } + } + } + +} |